Cynthia Sue Penn-Duecker, MD
Emergency Medicine Physician · Pleasanton, CA
Cynthia Sue Penn-Duecker, MD is an emergency medicine physician with a practice address in Pleasanton, California, and NPI 1033100359, issued on Nov 4, 2005. Check the license (California A43128, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cynthia Sue Penn-Duecker
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A43128 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5555 W Las Positas Blvd, Pleasanton, CA 94588
- Phone
- (209) 342-2300
- Enumerated
- Nov 4, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (209) 524-4240
- Medicaid ID
- 00A431280 CA
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 5555 W Las Positas Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dennis Alfaro, M.D.Emergency Medicine Physician1407847718
- Ashley Altman, MDDiagnostic Radiology Physician1649697947
- Joshua AshfordEmergency Registered Nurse1972458941
- Abinav Baweja, MDMedical Oncology Physician1770961575
- Brooke BettsPharmacist1962178491
- Myrna Castelazo, M.D.Diagnostic Radiology Physician1407290513
Verify Cynthia Sue Penn-Duecker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A43128Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average emergency medicine physician in 2024
60 Medicare Part D claims for 45 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Cynthia Sue Penn-Duecker among 7,751 emergency medicine physician records in California
Cynthia Sue Penn-Duecker, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 96% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2026 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
27 emergency medicine physician records list a practice address in Pleasanton
They are 27 of the 2,213 NPPES records with a practice address in Pleasanton, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Pleasanton → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Dennis Alfaro, M.D.Pleasanton, CA 945881407847718
- Paul Chasin, MDPleasanton, CA 945881649261959
- Michael Costello, MDPleasanton, CA 945881477544781
- Colleen Johnson, MDPleasanton, CA 945881720079049
- Edward Kan, MDPleasanton, CA 945881104804426
- Robert MandibergPleasanton, CA 945881336130640
- Gerald Nazareno, MDPleasanton, CA 945881679564983
- Scott Seidman, MDPleasanton, CA 945881184605230
Common questions
What is Cynthia Sue Penn-Duecker, MD's NPI number?
Cynthia Sue Penn-Duecker, MD's National Provider Identifier (NPI) is 1033100359, issued on Nov 4, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Cynthia Sue Penn-Duecker, MD located?
The NPPES record lists a practice address at 5555 W Las Positas Blvd, Pleasanton, CA, 94588. Phone: (209) 342-2300. Providers update this record themselves, so call before visiting.
How can I verify Cynthia Sue Penn-Duecker, MD's license?
NPPES lists California license number A43128, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cynthia Sue Penn-Duecker, MD prescribe under Medicare Part D?
In 2024, Cynthia Sue Penn-Duecker, MD had 60 Medicare Part D claims for 45 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Cynthia Sue Penn-Duecker, MD's MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.